Door-knob



(No Model.)

G. TIPPETT & D. MADLEM.

DOOR KNOB.

No. 346,566. Patented Aug. 3, 1886.

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UNITED STATES PATENT EEicE.

ROBERT G. TIPPETT AND DANIEL MADLEM, OF READING, PENNSYLVANIA.

DOOR-KNOB.

SPECIFICATION forming part of Letters Patent No. 346,566, dated August3, 1886.

Application filed December 11, 1885. Serial No. 185,356.

To all whom it may concern.-

Be it known that we, ROBERT G. TIPPETT and DANIEL MADLEM, citizens ofthe United States, residents at the city of Reading, county of Berks,State of Pennsylvania, have invented a new and useful Improvement inDoor-Knobs, of which the following is a specification.

This improvement relates more particularly to the class of door-knobsmade in separable parts, being cast hollow and secured in position uponaplain, smooth-surfaced, square-sectioned, non-perforate spindle.

The object of the improvement is to admit of casting the door-knobhollow, in two parts, if desired,of aninferior metal, (cast-irom) and tosecure the same together upon the spindles in a simple and positivemanner at the same time, with a removable grip, securing the knobsadjustably as to distance between each other.

Carpenters, joiners, and builders are well aware of the time consumed insecuring a nice working adjustment of the knobs within the rose-seats ofthe door, frequently requiring several trials before the properadjustment is secured. Ourknobandspindleovercomesthe above annoyance, asfrom their construction it is only necessary to insert the spindle withone knob in place, then slip on the remaining knob, tighten up a nut,and the whole is held securely in place without any readjustment be ingnecessary.

The drawings herewith, fully detailed, will show to an expert the natureof our improvement in door knobs and spindles and their connection witheach other, like letters of reference indicating like parts throughout.

Figure 1 represents a pair of knobs with their spindles, the right-handknob shown in section. Fig. 2 represents the spindle detached from theknobs; Fig. 3, a clamping taperthreaded nut by which adjustment of theknobs upon the spindle and the locking of the sepa rable parts of theknob upon each other is secured; Fig. 4, a side elevation and verticalsection of the same; Fig. 5, a reversed plan of the outer convex or capportion of the door-knob; Fig. 6, a sectional elevation of the samepiece, showing the binding and frictional grip-tangs secured within andforming an integral portion of the shell; Fig. 7, an end plan showingthe oblong perforation in the (No model.)

base of theknob forthe admission of the binding screw tangs and spindle;Fig. 8, a detached sectional elevation of the convex base portionofthedoor-knob; Fig. 9, an alternative device for securing the cap andbase of the knob together and as a frictional grip for adjustment of theknobs upon the spindle.

In the drawings, A represents the ordinary bar-spindle as used, withoutthreading or drilling, with our improved knobs.

B is the rose as used with the generality of knobs.

0 represents the hollow convex base portion of the knob; G, the shank ofthe same; 0 an oblong perforation in the shank; G a beveled edge to therim of the said convex portion.

D is the front convex portion or cap of the knob, having a re-enforcerim, D, and an offset seat, D",within the same, for the purpose offorming a connection with the base portion 0 In Fig. 1, E representstangs having re-enforce taper threaded ends E, which are stamped orformed of suitable metal, with the thread upon the same. These areplaced in the molds when the cap is formed, and become by burningtogether of the parts an integral portion of the cap D.

In Fig. 6 we show an alternative construction in which the tangs arestamped as an integral piece, F, and are subsequently bent at rightangles with a central base portion, and with a corrugate bend, F, ashort distance above the base. The object is to provide for anynon-conformity of the taper threads of the opposite tang ends,F ,as thecorrugation gives liberty for adjustment when the nut exerts itstensional pull upon the tangs, and the nut will come to a fair bearingupon the base of the knob.

In Fig. 9 we show as an alternative means of connection a tube, G,having a longitudinal square perforation, G,through the same, adapted toreceive the spindle A, one or more slots, G being cut therein, as shown,and the free end G threaded tapering to suit the nut H. When the piece Gis used, the perforation O in the shank of the base-piece O is madecircular instead of oblong, as shown in plan view Fig. 7. These severalpzrts are all cast with brazed upon, or suitably secured to the convexcentral portion of the cap D. We give preference to the single-piecetangs E, arranged to grip a square cross sectioned spindle, as shown inFig. 1.

In Figs. 3 and 4 we represent our gripping and adjusting nut H, havingprojected offsets H H the portion H adapted to enter the rose B, and tocontact with its seat, and the portion H to conform with the base 0 ofthe knob, the threaded apertures I being tapered to correspond with thetapered threaded ends of the tangs E, F, or G. I

The parts 0 and D, after cleaning, require 7 inspection to see that thebeveled edge 0 and the seat D will enter and interchange with eachother, and that the tangs are parallel with each other, and that theyare properly secured to the cap D, and that the perforation 0 will passfreely over the tang ends of any of the knob-castings.

To use the device, the parts are properly prepared, the lock and rosesbeing in place upon the door. A cap, D, is taken in hand and thebase-piece O slipped over the tangs with its bevel-edge 0 within there-en force D and resting upon the seat D The threaded tangs E, F or Gwill then project above or beyond the base of the knob. The nut H isthen screwed down upon the same. The spin dle A is now inserted betweenthe tangs and within the knob, and the nut tightened to a full bearingupon the base. This brings the flat face of the tangs in contact withthe corresponding faces of the spindle and securely holds the same, andat the same time draws the cap-D into close connection with the base 0.The spindle is then pushed through the door and lock and the knob heldin the roseseat, while the opposite knob, already put together, asdescribed, is slipped upon the spindle until its base contacts with theroseseat, when the nut H is tightened up and the knobs are removablyheld together and in place by the frictional grip of the tangs. It willbe seen that this construction gives a ready adjustment of length ofspindle ordistance between knobs to suit any variation of thickness ofdoors within reasonable limits. As the spindle may be moved in or drawnout of' either or both knobs tosuit the thickness of the door, and asthere are no trial fits to make, time is gained and neatness insuredupon every door using our improved device in combination with the locksof the same.

Having shown the construction, use, and advantages of our improvement,we desire to secure by Letters Patent the following claim thereon:

A separable door-knob consisting of a base portion, 0, having an oblonglongitudinal perforation, 0, through its shank, a beveled edge, 0 to itsbowl, in combination with a cap portion, D, provided with a re-enforce,D, seat D and tangs E, having taper-threaded ends E and taper-threadednut H,whereby the separable portions CDare securely held together,substantially as shown, described, and for the purpose set forth.

ROBERT c. TIPPETT. DANIEL MADLEM.

Witnesses:

JAMES R. KENNEY, MARoUs BEHM.

